Use the following information to answer the following questions.
In 1971, David Baltimore described a scheme for classifying viruses based on how the virus produces mRNA.
The table below shows the results of testing five viruses for nuclease specificity, the ability of the virus to act as an mRNA, and presence (+) or absence (-) of its own viral polymerase.

-Given Baltimore's scheme, a positive sense single-stranded RNA virus such as the polio virus would be most closely related to which of the following?
A) T-series bacteriophages
B) retroviruses that require a DNA intermediate
C) single-stranded DNA viruses such as herpes viruses
D) nonenveloped double-stranded RNA viruses
E) linear double-stranded DNA viruses such as adenoviruses

Question

Use the following information to answer the following questions.
In 1971, David Baltimore described a scheme for classifying viruses based on how the virus produces mRNA.
The table below shows the results of testing five viruses for nuclease specificity, the ability of the virus to act as an mRNA, and presence (+) or absence (-) of its own viral polymerase.
 
-Given Baltimore's scheme, a positive sense single-stranded RNA virus such as the polio virus would be most closely related to which of the following?
A) T-series bacteriophages 
B) retroviruses that require a DNA intermediate 
C) single-stranded DNA viruses such as herpes viruses 
D) nonenveloped double-stranded RNA viruses 
E) linear double-stranded DNA viruses such as adenoviruses

Quizplus · Accepted Answer

Baltimore's scheme classifies viruses based on how they produce mRNA, and positive sense single-stranded RNA viruses like polio virus use their genome directly as mRNA, similar to retroviruses that require a DNA intermediate. They both fall under Baltimore's Group VI classification. The other virus types listed are classified under different groups in Baltimore's scheme.

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